Mobile Antenna Impedance Matching Using Power Control Feedback
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Solution Overview
Problem
In wireless communication systems, the varying input impedance of antennas due to environmental factors, such as user interaction with mobile stations, leads to reduced transmit power efficiency and increased manufacturing costs due to the need for additional components for impedance matching.
Innovation Solution
A method and apparatus for antenna impedance matching in mobile stations that utilize power control information to generate matching control information, allowing for efficient impedance matching without additional components like couplers and detectors, focusing on maximizing the transfer coefficient rather than minimizing the reflection coefficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If antenna impedance matching is performed using reflection coefficient calculation, then transmit power efficiency is improved, but manufacturing cost increases due to additional components
Solution Approach 1:
The patent extracts and eliminates the unnecessary components (coupler and detector) from the traditional impedance matching system. By using power control information already present in the wireless communication system, the invention removes the need for additional hardware while maintaining impedance matching functionality, thereby reducing manufacturing cost without sacrificing transmit power efficiency.
Solution Approach 2:
The patent makes the power control information serve a dual function: its original purpose for power control and a new function for impedance matching. By utilizing existing power control information for both power adjustment and impedance matching decisions, the system achieves multi-functionality without requiring separate dedicated components, thus reducing manufacturing cost while maintaining efficiency.
2Loss of energy
If antenna impedance matching components are added, then transmit power efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges the impedance matching function with the existing power control mechanism. By combining these two functions and using the same power control information for both purposes, the system reduces device complexity while maintaining transmit power efficiency. The matching controller integrates impedance matching operations into the existing power control flow without requiring separate complex matching circuits.
Solution Approach 2:
The system uses its own existing power control information to perform impedance matching, rather than requiring external dedicated components. The mobile station's existing power control infrastructure serves the additional function of impedance matching, making the system self-sufficient and reducing overall complexity.
3Reliability
If traditional impedance matching method is used, then reflective wave is minimized, but additional components are required
Solution Approach 1:
The patent extracts and removes the unnecessary coupler and detector components from the traditional impedance matching system. By using power control information that already exists in the wireless communication system, the invention eliminates the need for additional hardware while maintaining the ability to minimize reflective waves through effective impedance matching.
Solution Approach 2:
The patent utilizes feedback from power control information to dynamically adjust impedance matching. The matching controller continuously receives power control information and adjusts matching parameters accordingly, providing ongoing feedback-based optimization of impedance matching without requiring additional sensing components.
Data Source
AI summary
An apparatus and method for matching antenna impedance in a mobile station are provided. In implementation, a mobile station receives power control information including information for controlling transmit power of the mobile station, generates matching control information for antenna impedance matching based on the received power control information, and performs antenna impedance matching depending on the generated matching control information.